Probing Strain-Induced Band Gap Modulation in 2D Hybrid Organic-Inorganic Perovskites

Qing Tu; Ioannis Spanopoulos; Shiqiang Hao; Christopher Wolverton; Mercouri G. Kanatzidis; Gajendra S. Shekhawat; Vinayak P. Dravid

doi:10.1021/acsenergylett.9b00120

Probing Strain-Induced Band Gap Modulation in 2D Hybrid Organic-Inorganic Perovskites

Qing Tu, Ioannis Spanopoulos, Shiqiang Hao, Christopher Wolverton, Mercouri G. Kanatzidis, Gajendra S. Shekhawat^*, Vinayak P. Dravid

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

51 Scopus citations

Abstract

In photovoltaics and flexible electronics applications, two-dimensional (2D) hybrid organic-inorganic perovskites (HOIPs) are often subjected to mechanical strain arising from materials processing, device functioning, and thermal expansion. Here we report for the first time a study of the band gap response to uniaxial tensile strain in thin 2D HOIP flakes with a general formula of (CH₃(CH₂)₃NH₃)₂(CH₃-NH₃)_n-1Pb_nI_3n+1. At large n (n > 3), the band gap will increase as the strain increases, and the strain response of band gap can be as high as 13.3 meV/% for n = 5, which is due to the rotation of the inorganic [PbI₆]^4- octahedra and the consequential Pb-I bond stretching and increase of Pb-I-Pb. Our findings provide a route to engineer the electronic properties of 2D HOIPs. The observed band gap-strain relationship can be harnessed to map the local mechanical strain in 2D HOIP-based devices and allow 2D HOIPs for sensing applications.

Original language	English (US)
Pages (from-to)	796-802
Number of pages	7
Journal	ACS Energy Letters
Volume	4
Issue number	3
DOIs	https://doi.org/10.1021/acsenergylett.9b00120
State	Published - Mar 8 2019

Funding

The work made use of the SPID and EPIC facilities of Northwestern University’s NUANCE center, which has received support from the Soft and Hybrid Nanotechnology Experimental (SHyNE) resource (NSF ECCS-1542205); the MRSEC program (NSF DMR-1720139) at the Materials Research Center; the International Institute for Nanotechnology (IIN); the Keck Foundation; and the State of Illinois, through the IIN. This work was supported by the National Science Foundation IDBR Grant Award Number 1256188 and was partially supported by Air Force Research Laboratory Grant FA8650-15-2-5518. M.G.K. acknowledges support under ONR Grant N00014-17-1-2231. This work was supported by the National Science Foundation IDBR Grant Award Number 1256188 and was partially supported by Air Force Research Laboratory Grant FA8650-15-2-5518. M.G.K. acknowledges support under ONR Grant N00014-17-1-2231.

ASJC Scopus subject areas

Chemistry (miscellaneous)
Renewable Energy, Sustainability and the Environment
Fuel Technology
Energy Engineering and Power Technology
Materials Chemistry

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1021/acsenergylett.9b00120

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title = "Probing Strain-Induced Band Gap Modulation in 2D Hybrid Organic-Inorganic Perovskites",

abstract = "In photovoltaics and flexible electronics applications, two-dimensional (2D) hybrid organic-inorganic perovskites (HOIPs) are often subjected to mechanical strain arising from materials processing, device functioning, and thermal expansion. Here we report for the first time a study of the band gap response to uniaxial tensile strain in thin 2D HOIP flakes with a general formula of (CH3(CH2)3NH3)2(CH3-NH3)n-1PbnI3n+1. At large n (n > 3), the band gap will increase as the strain increases, and the strain response of band gap can be as high as 13.3 meV/% for n = 5, which is due to the rotation of the inorganic [PbI6]4- octahedra and the consequential Pb-I bond stretching and increase of Pb-I-Pb. Our findings provide a route to engineer the electronic properties of 2D HOIPs. The observed band gap-strain relationship can be harnessed to map the local mechanical strain in 2D HOIP-based devices and allow 2D HOIPs for sensing applications.",

author = "Qing Tu and Ioannis Spanopoulos and Shiqiang Hao and Christopher Wolverton and Kanatzidis, {Mercouri G.} and Shekhawat, {Gajendra S.} and Dravid, {Vinayak P.}",

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AU - Kanatzidis, Mercouri G.

AU - Shekhawat, Gajendra S.

AU - Dravid, Vinayak P.

PY - 2019/3/8

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N2 - In photovoltaics and flexible electronics applications, two-dimensional (2D) hybrid organic-inorganic perovskites (HOIPs) are often subjected to mechanical strain arising from materials processing, device functioning, and thermal expansion. Here we report for the first time a study of the band gap response to uniaxial tensile strain in thin 2D HOIP flakes with a general formula of (CH3(CH2)3NH3)2(CH3-NH3)n-1PbnI3n+1. At large n (n > 3), the band gap will increase as the strain increases, and the strain response of band gap can be as high as 13.3 meV/% for n = 5, which is due to the rotation of the inorganic [PbI6]4- octahedra and the consequential Pb-I bond stretching and increase of Pb-I-Pb. Our findings provide a route to engineer the electronic properties of 2D HOIPs. The observed band gap-strain relationship can be harnessed to map the local mechanical strain in 2D HOIP-based devices and allow 2D HOIPs for sensing applications.

AB - In photovoltaics and flexible electronics applications, two-dimensional (2D) hybrid organic-inorganic perovskites (HOIPs) are often subjected to mechanical strain arising from materials processing, device functioning, and thermal expansion. Here we report for the first time a study of the band gap response to uniaxial tensile strain in thin 2D HOIP flakes with a general formula of (CH3(CH2)3NH3)2(CH3-NH3)n-1PbnI3n+1. At large n (n > 3), the band gap will increase as the strain increases, and the strain response of band gap can be as high as 13.3 meV/% for n = 5, which is due to the rotation of the inorganic [PbI6]4- octahedra and the consequential Pb-I bond stretching and increase of Pb-I-Pb. Our findings provide a route to engineer the electronic properties of 2D HOIPs. The observed band gap-strain relationship can be harnessed to map the local mechanical strain in 2D HOIP-based devices and allow 2D HOIPs for sensing applications.

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Probing Strain-Induced Band Gap Modulation in 2D Hybrid Organic-Inorganic Perovskites

Abstract

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ASJC Scopus subject areas

UN SDGs

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